Not being a math geek, I'm not quite sure what scatterplots really prove. But I find them weirdly fascinating.

This one, by Andrew Gelman, examines the social and economic leanings of voters from every state, as taken from a massive 2000 pre-election survey. The lower the number, the more liberal the state, either economically or socially. Oregon, as you can see, is definitely an outlier.